CHEMICAL REACTION ENGINEERING QUIZ

Molecularity of an elementary reaction, P + Q → R + S is

1

3

2

4

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YOUR ANSWER : ?

Reverse reaction in a chemical equilibrium is favoured by the

Increase in the concentration of oneof the products

Increase in the concentration of one of the reactants

Removal of one of the products regularly

None of these

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YOUR ANSWER : ?

If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion.

Ash layer

None of these

Film

Pore

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YOUR ANSWER : ?

A batch reactor is characterised by

Constant residence time

Very low conversion

Variation in extent of reaction and properties of the reaction mixture with time

Variation in reactor volume

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YOUR ANSWER : ?

Catalyst carriers

Have very high selectivity

Inhibit catalyst poisoning

Increase the activity of a catalyst

Provide large surface area with a small amount of active material

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YOUR ANSWER : ?

If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is

0

3

1

2

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YOUR ANSWER : ?

A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be

0.693τ

τ/0.693

0.5τ

2τ

TRUE ANSWER : ?
YOUR ANSWER : ?

The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line?

XA/(1 - XA)Vs τ

XA Vs ln τ

XA Vs . τ

XA(1 - XA)Vs τ

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YOUR ANSWER : ?

For all positive reaction orders for a particular duty,

Reactor size is independent of the type of flow

Density variation during reaction affects design

Mixed reactor is always larger than the plug-flow reactor

Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order

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YOUR ANSWER : ?

A catalyst in a chemical reaction

Increases the frequency of collisions of reacting species

Decreases the activation energy

Alters the reaction mechanism

All of these

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YOUR ANSWER : ?